受迫湍流流动及其激励机制是泵内流激振动的关键问题。本项目从错列平板叶栅基础绕流问题入手，运用先进的流场显示、测量和LES数值计算方法，研究绕叶栅形成的受迫湍流边界层、尾迹、尾涡脱落及尾迹干涉等基础流动问题。基于涡动力学理论分析、本征正交分解、频谱分析等流场数据解读，揭示受迫湍流的多重尺度涡结构及其时空演化特征。通过同步采集压力脉动、结构响应等信号并进行激励源识别，采用互相关函数分析不同尺度涡所对应的激励特性，构建涡动-响应内在关联关系，探究叶栅受迫湍流单向涡激振动机制。继而探索泵内动/静干涉环境下的受迫湍流涡动力学结构，捕捉泵内流激励响应特性，试图揭示泵内的涡激振动机制，初步形成基于涡动力学的泵内流激励理论。项目研究成果将对泵内流激振动机理作出新诠释，丰富涡激振动理论，为泵内受迫湍流涡的有效控制奠定基础，也可为装备主动减振降噪、低噪声设计方法研究提供理论支撑。

Confined turbulent flow and excitation mechanism is the key to flow induced vibration in pumps. Research starts on the fundamental flow in staggered flat plate cascade. Boundary layer flow, wake, vortex shedding and wake interaction will be studied by means of flow visualization, measurement and LES numerical approach. Flow field data will be processed and discussed by vortex dynamics theory, Proper Orthogonal Decomposition (POD) and spectrum analysis. Multi-scales vortex structure of confined turbulent flow will be revealed as well as its temporal and spatial evolutions. Static pressure pulsation and structure vibration acceleration will be measured synchronously, which are used for excitation source identification. Cross-correlation function will be applied to present corresponding excitation features from vortex with different scales. Relations between vortex dynamics and structure response will be established from the analysis. Vortex induced vibration mechanism will be carried out in confined flow of cascade. Furthermore, vortex structures of confined turbulent flow in pumps with rotor-stator interaction (RSI) will be studied. In order to reveal the vortex induced vibration in pumps, structure responses from internal flow excitation will be measured and discussed. Pump internal flow excitation theory based on vortex dynamics will be established. Project research will provide a new explanatory on pump internal flow induced vibration and enrich the vortex induced vibration theory. It may help lay a foundation for effective control of confined flow. It could also support the vibration and noise reduction actively, and low noise design method researches of related equipment.